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581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
125 lines
2.6 KiB
ArmAsm
125 lines
2.6 KiB
ArmAsm
/* strlen with SSE2 and BSF
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Copyright (C) 2010-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#if defined SHARED && IS_IN (libc)
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#include <sysdep.h>
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#define CFI_PUSH(REG) \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (REG, 0)
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#define CFI_POP(REG) \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (REG)
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#define PUSH(REG) pushl REG; CFI_PUSH (REG)
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#define POP(REG) popl REG; CFI_POP (REG)
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#define PARMS 4 + 8 /* Preserve ESI and EDI. */
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#define STR PARMS
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#define ENTRANCE PUSH (%esi); PUSH (%edi); cfi_remember_state
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#define RETURN POP (%edi); POP (%esi); ret; \
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cfi_restore_state; cfi_remember_state
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.text
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ENTRY ( __strlen_sse2_bsf)
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ENTRANCE
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mov STR(%esp), %edi
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xor %eax, %eax
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mov %edi, %ecx
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and $0x3f, %ecx
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pxor %xmm0, %xmm0
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cmp $0x30, %ecx
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ja L(next)
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movdqu (%edi), %xmm1
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %edx
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test %edx, %edx
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jnz L(exit_less16)
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mov %edi, %eax
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and $-16, %eax
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jmp L(align16_start)
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L(next):
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mov %edi, %eax
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and $-16, %eax
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pcmpeqb (%eax), %xmm0
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mov $-1, %esi
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sub %eax, %ecx
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shl %cl, %esi
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pmovmskb %xmm0, %edx
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and %esi, %edx
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jnz L(exit)
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L(align16_start):
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pxor %xmm0, %xmm0
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pxor %xmm1, %xmm1
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pxor %xmm2, %xmm2
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pxor %xmm3, %xmm3
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.p2align 4
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L(align16_loop):
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pcmpeqb 16(%eax), %xmm0
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pmovmskb %xmm0, %edx
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test %edx, %edx
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jnz L(exit16)
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pcmpeqb 32(%eax), %xmm1
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pmovmskb %xmm1, %edx
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test %edx, %edx
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jnz L(exit32)
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pcmpeqb 48(%eax), %xmm2
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pmovmskb %xmm2, %edx
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test %edx, %edx
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jnz L(exit48)
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pcmpeqb 64(%eax), %xmm3
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pmovmskb %xmm3, %edx
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lea 64(%eax), %eax
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test %edx, %edx
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jz L(align16_loop)
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L(exit):
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sub %edi, %eax
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L(exit_less16):
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bsf %edx, %edx
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add %edx, %eax
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RETURN
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L(exit16):
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sub %edi, %eax
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bsf %edx, %edx
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add %edx, %eax
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add $16, %eax
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RETURN
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L(exit32):
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sub %edi, %eax
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bsf %edx, %edx
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add %edx, %eax
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add $32, %eax
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RETURN
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L(exit48):
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sub %edi, %eax
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bsf %edx, %edx
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add %edx, %eax
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add $48, %eax
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POP (%edi)
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POP (%esi)
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ret
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END ( __strlen_sse2_bsf)
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#endif
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